CN105319788A - Liquid crystal display equipment - Google Patents
Liquid crystal display equipment Download PDFInfo
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- CN105319788A CN105319788A CN201410295404.8A CN201410295404A CN105319788A CN 105319788 A CN105319788 A CN 105319788A CN 201410295404 A CN201410295404 A CN 201410295404A CN 105319788 A CN105319788 A CN 105319788A
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Abstract
The invention discloses liquid crystal display equipment which comprises a first polarizing part, a second polarizing part, a liquid crystal panel and a compensating part. The second polarizing part is arranged to be opposite to the first polarizing part; the liquid crystal panel is arranged between the first polarizing part and the second polarizing part and comprises a first liquid crystal layer with a first aligning direction; the compensating part is arranged between the first polarizing part and the liquid crystal panel or between the second polarizing part and the liquid crystal panel and attached to the liquid crystal panel and comprises a second liquid crystal layer with a second aligning direction; the first aligning direction is the same as the second aligning direction, and the first liquid crystal layer and the second liquid crystal layer have the opposite dielectric anisotropy.
Description
Technical field
The invention relates to a kind of liquid crystal display, espespecially a kind of liquid crystal display that can improve visual angle asymmetry and the light leak condition caused because of liquid crystal pretilt angle.
Background technology
Liquid crystal display (LCD) is the display device of a thin plane, because it has the advantage of thin form, lightweight, low power consumption, therefore has replaced traditional cathode-ray tube display in recent years, and has become one of display device of universalness the most at present.The feature that LCD has, is thus widely used in little of portable terminal device, greatly to large-scale tv machine etc.But, the modal shortcoming of LCD is that its visual angle is too narrow, in order to head it off, the wide viewing angle display panel be suggested at present is such as: multi-domain perpendicular alignment-type (Multi-domainVerticalAlignment, MVA) liquid crystal display, plane inner switching type (In-PlanSwitch, IPS) type liquid crystal display and fringe field switch type (FringeFieldSwitching, FFS) liquid crystal display.
Wherein, the principle of IPS and FFS technology is: pixel electrode and public electrode form a plane electric fields, make liquid crystal molecule in the plane parallel with substrate, horizontally rotate to change the penetrance of light, because the liquid crystal molecule of horizontal component of electric field driving is in time rotating, remain horizontal direction, therefore the angle of visibility angle of IPS/FFS panel is high, and its with great visual angle under colour cast and the performance of saturation degree quite excellent.
The mode of general ip S/FFS LCD alignment is: at upper and lower base plate coating polyimide alignment film (PI), and carry out friction matching program with hair wheel cloth, make PI surface molecular have predetermined orientation, to provide liquid crystal, there is anchorage force at single direction.But, after orientation, because the dangling bonds (danglingbond) on its surface or side chain can cause liquid crystal arrangement direction and non-fully level, and there is a little tilt angle (about 2 degree).This tilt angle can cause that LCD dark-state visual angle is asymmetric, dark-state visual angle light leak is comparatively serious and the shortcoming such as cause viewing angle contrast's degree poor.In order to reduce liquid crystal pretilt angle, current technology normally changes alignment film material, or utilizes the mode of light orientation to carry out orientation; But still effectively cannot improve the problems referred to above.Therefore, a kind of liquid crystal display that can improve visual angle asymmetry and light leak condition of development is needed at present badly.
Summary of the invention
Fundamental purpose of the present invention is providing a kind of liquid crystal display, in order to do visual angle asymmetry and the light leak condition that can improve liquid crystal display.
For reaching above-mentioned purpose, the invention provides a kind of liquid crystal display, comprising: one first polarisation part; One second polarisation part is oppositely arranged with this first polarisation part; One liquid crystal panel, be arranged between this first polarisation part and this second polarisation part, and this liquid crystal panel comprises one first liquid crystal layer, this first liquid crystal layer has one first alignment direction; And a compensating part, be arranged between this first polarisation part and this liquid crystal panel or between this second polarisation part and this liquid crystal panel, and be attached on this liquid crystal panel, and this compensating part comprises one second liquid crystal layer, this second liquid crystal layer has one second alignment direction; Wherein, this first alignment direction is identical with this second alignment direction essence, and described first liquid crystal has contrary dielectric anisotropy with described second liquid crystal.
Accordingly, liquid crystal display of the present invention is by arranging this compensating part, utilize liquid crystal type complementary in itself and this first liquid crystal layer, and optionally adjust compensating part thickness, the tilt angle of the second liquid crystal layer (such as, angle in this second liquid crystal layer between a minor axis of liquid crystal molecule and this first polarisation part), or setting position, with significantly improve because of this first liquid crystal layer tilt angle (such as, angle in this first liquid crystal layer between a major axis of liquid crystal molecule and this first polarisation part) and the visual angle asymmetry caused and light leak condition, reach and make the visual angle of liquid crystal display of the present invention wider, more symmetrical, and light leak is less.
Accompanying drawing explanation
For further illustrating technology contents of the present invention, be described in detail as follows below in conjunction with embodiment and accompanying drawing, wherein:
Figure 1A is the liquid crystal display schematic diagram of a preferred embodiment of the present invention.
Figure 1B is the schematic diagram of multiple first liquid crystal in the liquid crystal layer of the liquid crystal display of Figure 1A.
Fig. 1 C is the schematic diagram of multiple second liquid crystal in the layer of compensation of the liquid crystal display of Figure 1A.
Fig. 2 A to 2C is the test result of liquid crystal display for dark-state light leak of Figure 1A.
Fig. 3 is the liquid crystal display schematic diagram of another preferred embodiment of the present invention.
Fig. 4 A to 4C is the test result of liquid crystal display for dark-state light leak of Fig. 3.
Fig. 5 is the liquid crystal display schematic diagram of the present invention's preferred embodiment again.
Fig. 6 A to 6C is the test result of liquid crystal display for dark-state light leak of Fig. 5.
Fig. 7 is the schematic diagram that the second liquid crystal pretilt angle in the liquid crystal display of Fig. 5 and thickness affect dark-state light leak.
Fig. 8 is the liquid crystal display schematic diagram of a preferred embodiment of the present invention.
Embodiment
Be below, by particular specific embodiment, embodiments of the present invention are described, the personage haveing the knack of this technology can understand other advantages of the present invention and effect easily by content disclosed in the present specification.The present invention is also implemented by other different specific embodiments or is applied, and the every details in this instructions also for different viewpoints and application, can carry out various modification and change under not departing from spirit of the present invention.
Embodiment 1
Figure 1A is the liquid crystal display schematic diagram of a preferred embodiment of the present invention.This liquid crystal display comprises: one first polarisation part 1; One second polarisation part 2 is oppositely arranged with this first polarisation part 1; One liquid crystal panel, comprises one first liquid crystal layer 3, is to be arranged between this first polarisation part 1 and this second polarisation part 2; And a compensating part, comprising one second liquid crystal layer 4, is to be arranged between this first polarisation part 1 and this second polarisation part 2 and to be attached on this liquid crystal panel.In the present embodiment, this compensating part is attached on this liquid crystal panel and is arranged between this first polarisation part 1 and this first liquid crystal layer 3; But this compensating part also can be arranged between this second polarisation part 2 and this first liquid crystal layer 3.
Refer again to Figure 1B and 1C, it is respectively the schematic diagram of multiple liquid crystal molecule 41 in the second liquid crystal layer 4 of multiple liquid crystal molecule 31 and compensating part in the first liquid crystal layer 3; This first liquid crystal layer 3 has one first alignment direction, and the second liquid crystal layer 4 of this layer of compensation has one second alignment direction; Wherein, this first alignment direction is roughly the same with this second alignment direction, and can have ± the error of 0.2 degree, and this first liquid crystal layer 3 is smooth positive type liquid crystal in the present embodiment, this second liquid crystal layer 4 is smooth negative type liquid crystals.The characteristic of light positive type liquid crystal is extraordinary ray refractive index (ne) > ordinary refraction index (no), is commonly referred to as rod shaped liquid crystal; And the characteristic of light negative type liquid crystal is ordinary refraction index (nof) > extraordinary ray refractive index (nef), is commonly referred to as disc-like liquid crystal.
The general structure of this compensating part is with upper and lower transparent plastic substrate (not shown) this second liquid crystal layer 4 sandwiched, and is generally that film-form is to be placed between this liquid crystal panel and this first polarisation part (or second polarisation part).In making, first this compensating part can be adhered on this first polarisation part, then fit with this liquid crystal panel together; Also this compensating part first can be adhered on this liquid crystal panel surface, then this first polarisation part of fitting on compensating part.
Second liquid crystal layer 4 of this first liquid crystal layer 3 and this compensating part can carry out orientation via various known method, and in the present embodiment, second liquid crystal layer 4 of this first liquid crystal layer 3 and this compensating part is coated with polyimide alignment film (PI) via at upper and lower base plate, and carry out friction matching program with hair wheel cloth, PI surface molecular is made to have predetermined orientation, to provide liquid crystal to have anchorage force at single direction, this first liquid crystal layer 3 and this second liquid crystal layer 4 is made to have the first alignment direction and the second alignment direction respectively.
In the description, contingent error amount during " error of ± 0.2 degree " expression this orientation angle of calculating, comprises the error that various personal error, environmental baseline error, instrument error etc. are caused; Generally speaking, in this technical field, acceptable error angle scope is within ± 0.2 degree, such as: there is-0.2 degree ,-0.1 degree, spend for 0 degree ,+0.1 or+0.2 error spent.
Further, in the present embodiment, the liquid crystal molecule 31 in this first liquid crystal layer 3 is light positive type liquid crystal, and the liquid crystal molecule 41 in this second liquid crystal layer 4 is light negative type liquid crystal; One major axis 311 and the interplanar of this first polarisation part 1 of the liquid crystal molecule 31 of this first liquid crystal layer 3 have one first angle θ 1 (i.e. general alleged tilt angle), one minor axis 411 of the liquid crystal molecule 41 of this second liquid crystal layer 4 has one second angle θ 2 (in figures 1 b, 1 c with the interplanar of this first polarisation part 1, the plane of this first polarisation part 1 parallel is represented) with dotted line 11, and this first angle can differ 2 to 2 with this second angle spends, be preferably this first angle identical with this second angle.In other words, between the first angle and the second angle, relation is preferably θ 1-2 < θ 2 < θ 1+2 (deg).In addition, the total phasic difference passing through this first liquid crystal layer 3 when light is (Δ nd) cell, when light is (Δ nd) film by total phasic difference of this second liquid crystal layer 4, goodly meet (Δ nd) cell-100 < (Δ nd) film < (Δ nd) cell+100 (nm).
In liquid crystal display of the present invention, there is no particular restriction for the ordinary refraction index of this first liquid crystal layer 3 and this second liquid crystal layer 4 and extraordinary ray refractive index, the ordinary refraction index (no) being preferably this first liquid crystal layer 3 is roughly the same with the extraordinary ray refractive index (nef) of this second liquid crystal layer 4, and the extraordinary ray refractive index (ne) of this first liquid crystal layer 3 is roughly the same with the ordinary refraction index (nof) of this second liquid crystal layer 4.
If consider the thickness of the first liquid crystal layer of this liquid crystal panel and the second liquid crystal layer of this compensating part, this first liquid crystal layer and this second liquid crystal layer are preferably and meet following equation:
[equation]
Wherein, nof is the ordinary refraction index of this second liquid crystal layer, nef is the extraordinary ray refractive index of this second liquid crystal layer, df is the thickness of this second liquid crystal layer, ne is the extraordinary ray refractive index of this first liquid crystal layer, no is the ordinary refraction index of this first liquid crystal layer, and d is the thickness of this first liquid crystal layer.Symbol "
" mean its both sides numerical value roughly the same each other, and " roughly the same " one word be consider ± 5, ± 3, ± 1 or ± 0.5 within error amount.
In addition, in the present invention, total phasic difference value that second thickness of liquid crystal layer (df) and the refringence of compensating part are arranged in pairs or groups is not limited, can meet the condition of (no-ne) xd-100 < (nof-nef) xdf < (no-ne) xd+100 (nm).
Described in first liquid crystal layer 3, the configuration kenel of liquid crystal molecule 31 is not limited, can be plane inner switching type (IPS) and fringe field switch type (FFS); In the present embodiment, the configuration kenel of the first liquid crystal layer 3 is plane inner switching type (IPS).
Fig. 2 A to 2C is the test result of liquid crystal display for dark-state light leak; Wherein, the first liquid crystal layer 3 refractive index ne=1.5876, no=1.4850 and thickness d=3.10 μm and be the light irradiating liquid crystal display device from the first polarisation part 1 side with Single wavelength 550nm test.
Fig. 2 A, 2B are control groups, do not arrange compensating part, Fig. 2 A be simulated solution crystal layer do not have tilt angle (θ 1=0) time result; Result when Fig. 2 B is simulation first liquid crystal layer 3 tilt angle 2 degree (θ 1=2).Fig. 2 C is the test results of the device of Figure 1A, (namely first angle θ 1 of the first liquid crystal layer 3 in its liquid crystal display and the second angle θ 2 of compensating part second liquid crystal layer 4 is all 2 degree, there is identical tilt angle), and the first liquid crystal layer 3 has the identical phase difference value of essence with the second liquid crystal layer 4 of compensating part, refractive index nef=1.5430, the nof=1.6035 of the second liquid crystal layer 4 and thickness d f=5.25 μm.Accordingly, compared by Fig. 2 A, 2B and can obviously find out when arranging for uncompensated, because the existence of tilt angle can make dark-state light leak present left-right asymmetry situation; And compensating part is set in Fig. 2 C effectively can improves dark-state viewing angle symmetry when tilt angle exists and light leak degree.
[embodiment 2]
Fig. 3 is the liquid crystal display schematic diagram of another preferred embodiment of the present invention, except more arranging a commercially available compensation film for angular field of view 5 between the first polarisation part 1 and compensating part 4 (in the present embodiment, use NAZ270 compensate film) outward, all the other elements are all identical with Figure 1A liquid crystal display of embodiment 1; The part identical with embodiment 1 is repeated no more in this.
Fig. 4 A to 4C is the test result of liquid crystal display for dark-state light leak.Test when the light irradiating liquid crystal display device from the first polarisation part 1 side with Single wavelength 550nm.
Liquid crystal display in Fig. 4 A is provided with commercially available compensation film for angular field of view 5, and the first liquid crystal layer 3 in liquid crystal panel does not have a tilt angle (θ 1=0); Liquid crystal display in Fig. 4 B is provided with commercially available compensation film for angular field of view 5, and the first liquid crystal layer 3 in liquid crystal panel has the tilt angle (θ 1=2) of 2 degree; Fig. 4 C is the test results of the embodiment of the present invention 2 of Fig. 3, its liquid crystal display is provided with commercially available compensation film for angular field of view 5, has the compensating part of the second liquid crystal layer 4, and the first liquid crystal layer and the second liquid crystal layer all have the tilt angle (θ 1=2, θ 2=2) of 2 degree.Can be found out when there being tilt angle by Fig. 4 A, 4B, light leak and asymmetry problem can be more serious because of the setting of commercially available compensation film for angular field of view, this is because commercially available compensation film for angular field of view mainly compensates for side-looking angle optical path difference and do not consider the visual angle light leak that tilt angle causes; Accordingly, obviously can find out that the embodiment of the present invention 2 is arranged after compensating part can effectively improved dark state viewing angle symmetry and light leak degree.
In addition, this commercially available compensate film 5 also can be arranged between this first liquid crystal layer 3 and this second polarisation part 2; Or, if when this compensating part 4 to be attached on this first liquid crystal layer 3 and to be arranged between this second polarisation part 2 and this first liquid crystal layer 3, this commercially available compensate film 5 can be arranged between this first polarisation part 1 and this first liquid crystal layer 3 or be arranged between this compensating part 4 and this second polarisation part 2.Accordingly, those skilled in the art can adjust the relative position of described element according to physical condition.
[embodiment 3]
Fig. 5 is the liquid crystal display schematic diagram of the present invention's preferred embodiment again.The impact that multi-wavelength incident light and other retes of liquid crystal panel cause is further considered in the present embodiment.This liquid crystal panel is also included in and arranges a thin film transistor base plate 6 between the first liquid crystal layer 3 and compensating part 4 and arrange a colored filter substrate 7 between the first liquid crystal layer 3 and the second polarisation part 2; In addition, all the other elements are all identical with Fig. 3 liquid crystal display of embodiment 2, repeat no more the part identical with embodiment 2 in this.
In this example, Fig. 5 eliminates the detailed construction illustrating thin film transistor base plate 6, comprises a grid, an insulation course, semi-conductor layer, one source pole and a drain electrode etc.; And eliminate the detailed construction illustrating colored filter substrate 7, comprise a black matrix, a chromatograph and an insulation course etc.But have in the art and usually know that the knowledgeable can understand abridged thin film transistor base plate and color filter substrate structure easily, known structure all can be applicable to the present invention.
Fig. 6 A to 6C is the test result of liquid crystal display for dark-state light leak.Test condition is from the first polarisation part 1 side with the LED backlight module of multi-wavelength (BLU) frequence spectrum radiation liquid crystal display, and liquid crystal panel has thin film transistor base plate, liquid crystal layer, and emulates under the structure of colored filter substrate.
Fig. 6 A is control group, simulate when the first liquid crystal layer of liquid crystal panel do not have tilt angle (θ 1=0) and only arrange in pairs or groups commercially available compensation film for angular field of view time light leak result; , Fig. 6 B is another control group, simulate when liquid crystal panel the first liquid crystal layer tool 2 degree of tilt angles (θ 1=2) and only arrange in pairs or groups commercially available compensation film for angular field of view time light leak result; Fig. 6 C is the test results of the device of Fig. 5, namely simulation when the first liquid crystal layer tool 2 degree of tilt angles (θ 1=2) of liquid crystal panel and the compensating part of commercially available compensation film for angular field of view of simultaneously arranging in pairs or groups, tool second liquid crystal layer time light leak result, and the second liquid crystal layer also has 2 degree of tilt angles (θ 2=2); Accordingly, can obviously find out compensating part is set can improved dark state viewing angle symmetry and light leak degree, the improvement effect especially for low light leak region is more obvious.
But in order to obtain better effect, inventor more adjusts the second liquid crystal layer tilt angle (that is, the second angle θ 2) in the liquid crystal display of Fig. 5 and thickness (df), and result as shown in Figure 7.Therefore, known second angle (θ 2) is about 3 degree, during thickness (df) about 6 μm, can obtain best viewing angle symmetry and minimum light leak degree.Accordingly, can infer that the mean refractive index ((nef+nof)/2=1.57325) when the second liquid crystal layer in compensating part is greater than the mean refractive index ((ne+no)/2=1.5363) of the first liquid crystal layer in liquid crystal panel, then the second angle θ 2 of the second liquid crystal layer need be a bit larger tham the first angle θ 1 of the first liquid crystal layer, and can there be good compensation effect the beginning.
In addition, in the present embodiment, compensating part 4 also can be arranged between this colored filter substrate 7 and this second polarisation part 2; Or, if when this commercially available compensate film 5 is arranged between this colored filter substrate 7 and this second polarisation part 2, compensating part 4 can be arranged between this first polarisation part 1 and this thin film transistor base plate 6, between this colored filter substrate 7 and this commercially available compensate film 5 or between this commercially available compensate film 5 and this second polarisation part 2.Accordingly, those skilled in the art can adjust the relative position of described element according to physical condition.
In this, embodiments of the invention eliminate other elements of other known liquid crystal displays, such as: substrate and backlight module etc.Substrate, as glass substrate, plastic base, silicon substrate and ceramic substrate etc.; Backlight module, comprises backboard, light guide plate and optical layers etc.Have in the art and usually know that the knowledgeable can understand element in the liquid crystal display of abridged easily, known conventional element all can be applicable to the present invention.
At this, as shown in Figure 8, only using a LCD TV 100 as an example of liquid crystal display of the present invention, in addition, the liquid crystal display obtained by previous embodiment of the present invention also can be the display devices such as mobile phone, notebook computer, video camera, camera, music player, action navigation device.
Above-described embodiment is only citing for convenience of description, and the interest field that the present invention advocates from should being as the criterion with described in right, but not is only limitted to above-described embodiment.
Claims (10)
1. a liquid crystal display, comprising:
One first polarisation part;
One second polarisation part, is oppositely arranged with this first polarisation part;
One liquid crystal panel, be arranged between this first polarisation part and this second polarisation part, and this liquid crystal panel comprises one first liquid crystal layer, this first liquid crystal layer has one first alignment direction; And
One compensating part, be arranged between this first polarisation part and this liquid crystal panel or between this second polarisation part and this liquid crystal panel, and be attached on this liquid crystal panel, and this compensating part comprises one second liquid crystal layer, this second liquid crystal layer has one second alignment direction;
Wherein, this first alignment direction is identical with this second alignment direction, and this first liquid crystal layer has contrary dielectric anisotropy with this second liquid crystal layer.
2. liquid crystal display as claimed in claim 1, wherein, between a major axis of liquid crystal molecule and this first polarisation part, there is one first angle in this first liquid crystal layer, between a minor axis of liquid crystal molecule and this first polarisation part, there is one second angle in this second liquid crystal layer, and this first angle differs one 2 to 2 with this second angle spends.
3. liquid crystal display as claimed in claim 1, wherein, this compensating part is arranged between this first polarisation part and this liquid crystal panel.
4. liquid crystal display as claimed in claim 1, wherein, this compensating part is arranged between this second polarisation part and this liquid crystal panel.
5. liquid crystal display as claimed in claim 1, wherein, the ordinary refraction index of this first liquid crystal layer is identical with the extraordinary ray refractive index of this second liquid crystal layer, and the extraordinary ray refractive index of this first liquid crystal layer is identical with the ordinary refraction index of this second liquid crystal layer.
6. liquid crystal display as claimed in claim 1, wherein, the first liquid crystal layer of this liquid crystal panel and the second liquid crystal layer of this compensating part meet following equation:
Equation
(ne-no)xd100＜(nof-nef)xdf＜(ne-no)xd+100
Wherein, nof is the ordinary refraction index of this second liquid crystal layer, nef is the extraordinary ray refractive index of this second liquid crystal layer, df is the thickness of this second liquid crystal layer, ne is the extraordinary ray refractive index of this first liquid crystal layer, no is the ordinary refraction index of this first liquid crystal layer, and d is the thickness of this first liquid crystal layer.
7. liquid crystal display as claimed in claim 1, wherein, this liquid crystal panel also comprises: a colored filter substrate, be arranged between this second polarisation part and this first liquid crystal layer, and this compensating part is attached on this colored filter substrate.
8. liquid crystal display as claimed in claim 1, wherein, this liquid crystal panel also comprises: a colored filter substrate, be arranged between this second polarisation part and this first liquid crystal layer, and this compensating part is arranged between this first polarisation part and this liquid crystal panel.
9. liquid crystal display as claimed in claim 1, wherein, this liquid crystal panel also comprises: a thin film transistor base plate, be arranged between this first polarisation part and this first liquid crystal layer, and this compensating part is attached on this thin film transistor base plate.
10. liquid crystal display as claimed in claim 1, wherein, this liquid crystal panel also comprises: a thin film transistor base plate, be arranged between this first polarisation part and this first liquid crystal layer, and this compensating part is arranged between this second polarisation part and this liquid crystal panel.
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| CN201410295404.8A CN105319788A (en) | 2014-06-26 | 2014-06-26 | Liquid crystal display equipment |
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| CN201410295404.8A CN105319788A (en) | 2014-06-26 | 2014-06-26 | Liquid crystal display equipment |
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| CN108563060A (en) * | 2018-01-26 | 2018-09-21 | 惠州市华星光电技术有限公司 | Liquid crystal display panel and liquid crystal display device |
| CN110068949A (en) * | 2018-01-22 | 2019-07-30 | 群创光电股份有限公司 | Show equipment |
| CN110660371A (en) * | 2019-09-30 | 2020-01-07 | 青岛海信电器股份有限公司 | Liquid crystal module display correction method and device |
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